Object not appearing the render, but is appearing in viewport render
However I have not watched this tutorial but it seems particle system is used for sprinkles on ice and I think You Have Disabled the 'Show Emmiter' Option in Particle settings
but in viewport display it is enabled that's why this ice is shown in viewport but not in rendered view 

for emmiter ie; ice to be visible in rendered view just go to particle settings and in render check "show emmiter " and this will work